Error Codes & FAQ
Quickly search for an error code:
31
Module protection failure
- Compressor damage
- Compressor IPM module damage
- System blockage
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
32
Fault with the driver EEPROM
- Damage of the EE chip of driver board
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
34
Compressor protection failure
- Compressor power line not connected
- Compressor sequence connection error
- Damage of compressor
- System blockage
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
35
AC over-current protection of the whole machine
- Excessive running current of the unit
- Voltage drops abruptly during operation
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
36
Fault with the over-voltage or low-voltage protection
- Excessive input voltage
- Lower input voltage
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
39
IPM temperature sensor fault
- Compressor IPM module sensor damage
- Poor contact between compressor IPM module and radiator
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
3C
Outdoor DC fan motor over-current protection
- Current of the outdoor DC fan is too high
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
3E
Compressor drive PFC software protection
- Damage of the PFC circuit components
- Reactor damage
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
3F
Compressor drive PFC hardware protection
- Damage of the PFC circuit components
- Reactor damage
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
3H
Fault with the fan motor over-current protection
- Damage of motor
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
3J
Overvoltage protection of outdoor DC fan motor
- Voltage of the outoor DC fan is too high or too low
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
41
IPM protection of outdoor DC fan
- IPM device of DC motor is faulty
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
A1
Fault with the room termperature sensor on the N# indoor unit
- Damage of the room temperature sensor on the indoor unit
- Poor contact of the room temperature sensor on the indoor unit
- Damage of wiring of the room temperature sensor on the indoor unit
- Damage of the main PCB on the indoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
A2
Fault with the temperature sensor in the middle of N# indoor evaporator
- Damage of the temperature sensor on the indoor unit
- Poor contact of the temperature sensor on the indoor unit
- Damage of wiring of the temperature sensor on the indoor unit
- Damage of the main PCB on the indoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
A3
Fault of temperature sensor at N# evaporator inlet
- Damage of the temperature sensor at N# evaporator inlet
- Poor contact of the room temperature sensor at N# evaporator inlet
- Damage of wiring of the room temperature sensor at N# evaporator inlet
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
A4
Fault of temperature sensor at N# evaporator outlet
- Damage of the temperature sensor at N# evaporator outlet
- Poor contact of the room temperature sensor at N# evaporator outlet
- Damage of wiring of the room temperature sensor at N# evaporator outlet
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
A5
Fault with the drainage on N# indoor unit
- Float switch disconnected or poor wiring
- Error setting of model parameters
- Drain plug
- Damage of the pump
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
A6
Fault with the fan motor on N# indoor unit
- Low voltage
- Poor wiring
- Damange of the main PCB on the indoor unit
- Damage of the motor
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
A9
Communication error between the outdoor unit and the N# indoor unit
- Damage of the main PCB on the indoor unit
- Damange of the main PCB on the outdoor unit
- Poor wiring
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
AA
Communication error between the wired controller and main PCB of the indoor unit
- Damange of the main PCB on the indoor unit
- Damange of the display board on the indoor unit
- Poor wiring
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
AD
Indoor anti-freezing protection
- Blockage of heat exchanger in indoor refrigeration unit
- Blockage of internal fan
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
C1
Fault with the environmental temperature sensor on the outdoor unit
- Damage of the environmental temperature sensor on the outdoor unit
- Poor contact of the environmental temperature sensor on the outdoor unit
- Damage of the wiring of the environmental temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
C2
Fault with the defrosting temperature sensor on the outdoor unit
- Damage of the defrosting temperature sensor on the outdoor unit
- Poor contact of the defrosting temperature sensor on the outdoor unit
- Damage of the wiring of the defrosting temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
C3
Fault with the discharge temperature sensor
- Damage of the discharge temperature sensor on the outdoor unit
- Poor contact of the discharge temperature sensor on the outdoor unit
- Damage of the wiring of the discharge temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
C6
Fault with the suction temperature sensor
- Damage of the suction temperature sensor on the outdoor unit
- Poor contact of the suction temperature sensor on the outdoor unit
- Damage of the wiring of the suction temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
C8
Fault with the temperature sensor in the middle of outdoor condenser
- Damage of the temperature sensor on the outdoor unit
- Poor contact of the temperature sensor on the outdoor unit
- Damage of the wiring of the temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
E0
IDU overcurrent protection
Single Zone
E1
Fault of four-way valve
- Damage of four-way valve
- Damage to coil of four-way valve
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
E1
Fault with the room termperature sensor on the N# indoor unit
- Damage of the room temperature sensor on the indoor unit
- Poor contact of the room temperature sensor on the indoor unit
- Damage of wiring of the room temperature sensor on the indoor unit
- Damage of the main PCB on the indoor unit
Multi-Zone (High Wall Unit)
E1
Room temperature sensor failure
- Damage of the room temperature sensor on the indoor unit
- Poor contact of the room temperature sensor on the indoor unit
- Damage of wiring of the room temperature sensor on the indoor unit
- Damage of the main PCB on the indoor unit
Single Zone
E2
Outdoor coil sensor failure
- Damage of the defrosting temperature sensor on the outdoor unit
- Poor contact of the defrosting temperature sensor on the outdoor unit
- Damage of the wiring of the defrosting temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Single Zone
E2
Fault with the defrosting condenser temperature sensor on the outdoor unit
- Damage of the defrosting temperature sensor on the outdoor unit
- Poor contact of the defrosting temperature sensor on the outdoor unit
- Damage of the wiring of the defrosting temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (High Wall Unit)
E3
Protection high temperature discharge
- Lack of refrigerant
- Stop valve unopened
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
E3
Fault with the temperature sensor in the middle of N# indoor evaporator
- Damage of the temperature sensor on the indoor unit
- Poor contact of the temperature sensor on the indoor unit
- Damage of wiring of the temperature sensor on the indoor unit
- Damage of the main PCB on the indoor unit
Multi-Zone (High Wall Unit)
E3
Indoor coil sensor failure
- Damage of the temperature sensor on the indoor unit
- Poor contact of the temperature sensor on the indoor unit
- Damage of wiring of the temperature sensor on the indoor unit
- Damage of the main PCB on the indoor unit
Single Zone
E4
PG motor or DC fan failure
- Low voltage
- Poor wiring
- Damange of the main PCB on the indoor unit
- Damage of the motor
Single Zone
E4
Fault with the fan motor of N# indoor unit
- Low voltage
- Poor wiring
- Damange of the main PCB on the indoor unit
- Damage of the motor
Multi-Zone (High Wall Unit)
E5
Internal and external communication failure
- Damage of the main PCB on the indoor unit
- Damange of the main PCB on the outdoor unit
- Poor wiring
Single Zone
E5
Communication error between the outdoor unit and the N# indoor unit
- Damage of the main PCB on the indoor unit
- Damange of the main PCB on the outdoor unit
- Poor wiring
Multi-Zone (High Wall Unit)
E8
High temperature protection for refrigeration outdoor
- Poor outdoor heat transfer
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
E8
Communication error between the display board and main PCB of the indoor unit
- Damange of the main PCB on the indoor unit
- Damange of the display board on the indoor unit
- Poor wiring
Multi-Zone (High Wall Unit)
F0
Outdoor fan failure
- Damage of motor
Single Zone
F0
Fault with the fan motor of outdoor unit
- Damage of motor
Multi-Zone (High Wall Unit)
F1
Module protection failure
- Compressor damage
- Compressor IPM module damage
- System blockage
Multi-Zone (High Wall Unit)
F1
Module protection failure
- Compressor damage
- Compressor IPM module damage
- System blockage
Single Zone
F2
PFC protection failure
- Damage of the PFC circuit components
- Reactor damage
Single Zone
F2
Compressor drive PFC protection
- Damage of the PFC circuit components
- Reactor damage
Multi-Zone (High Wall Unit)
F3
Compressor protection failure
- Compressor power line not connected
- Compressor sequence connection error
- Damage of compressor
- System blockage
Multi-Zone (High Wall Unit)
F3
Compressor startup failure or out-of-step operation
- Compressor power line not connected
- Compressor sequence connection error
- Damage of compressor
- System blockage
Single Zone
F4
Outdoor exhaust sensor failure
- Damage of the discharge temperature sensor on the outdoor unit
- Poor contact of the discharge temperature sensor on the outdoor unit
- Damage of the wiring of the discharge temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Single Zone
F4
Fault with the discharge temperature sensor
- Damage of the discharge temperature sensor on the outdoor unit
- Poor contact of the discharge temperature sensor on the outdoor unit
- Damage of the wiring of the discharge temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (High Wall Unit)
F5
Temperature protection of compressor top cover
- Damage of compressor top cover switch
- System blockage
Multi-Zone (High Wall Unit)
F5
Compressor top cover protector failure
- Damage of compressor top cover switch
- System blockage
Single Zone
F6
Outdoor environmental temperature sensor failure
- Lack of refrigerant
- Heat exchange viscera
Single Zone
F6
Fault with the environmental temperature sensor on the outdoor unit
- Damage of the environmental temperature sensor on the outdoor unit
- Poor contact of the environmental temperature sensor on the outdoor unit
- Damage of the wiring of the environmental temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (High Wall Unit)
F6
Low pressure protection
- Lack of refrigerant
- Heat exchange viscera
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
F7
Over & under voltage safeguard
- Excessive input voltage
- Lower input voltage
Single Zone
F7
Fault with the over-voltage or low-voltage protection
- Excessive input voltage
- Lower input voltage
Multi-Zone (High Wall Unit)
F8
Outdoor main control board & communicating module failure
- Damage of the driver PCB on the outdoor unit
- Damage of the main PCB on the outdoor unit
- Poor wiring
Single Zone
F8
Communication error between the driver PCB and main PCB of the outdoor unit
- Damage of the driver PCB on the outdoor unit
- Damage of the main PCB on the outdoor unit
- Poor wiring
Multi-Zone (High Wall Unit)
F9
Fault with the outdoor unit EEPROM
- Fault with the EE chip on the outdoor PCB
Multi-Zone (High Wall Unit)
F9
Outdoor E-side failure
- Fault with the EE chip on the outdoor PCB
Single Zone
FA
Fault with the suction temperature sensor
- Damage of the suction temperature sensor on the outdoor unit
- Poor contact of the suction temperature sensor on the outdoor unit
- Damage of the wiring of the suction temperature sensor on the outdoor unit
- Damage of the main PCB on the outdoor unit
Multi-Zone (High Wall Unit)
FH
Protection low temperature discharge
- Temperature sensor shedding
- Damage of the main PCB on the outdoor unit
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
H1
High pressure switch protection
- System blockage
- Damage of high pressure switch
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
H1
Fault with the drainage on N# indoor unit
- Float switch disconnected or poor wiring
- Error setting of model parameters
- Drain plug
- Damage of the pump
Multi-Zone (High Wall Unit)
H2
Communication error between the wired controller and main PCB of the indoor unit
- Damange of the main PCB on the indoor unit
- Damange of the display board on the indoor unit
- Poor wiring
Multi-Zone (High Wall Unit)
H3
Fault of temperature sensor at N# evaporator inlet
- Damage of the temperature sensor at N# evaporator inlet
- Poor contact of the room temperature sensor at N# evaporator inlet
- Damage of wiring of the room temperature sensor at N# evaporator inlet
- Damage of the main PCB on the outdoor unit
Multi-Zone (High Wall Unit)
H4
Low pressure switch protection
- Lack of refrigerant
- Stop valve unopened
- Damage of low pressure switch
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
H4
Fault of temperature sensor at N# evaporator outlet
- Damage of the temperature sensor at N# evaporator outlet
- Poor contact of the room temperature sensor at N# evaporator outlet
- Damage of wiring of the room temperature sensor at N# evaporator outlet
- Damage of the main PCB on the outdoor unit
Multi-Zone (High Wall Unit)
H5
Protection low temperature discharge
- Temperature sensor shedding
- Damage of the main PCB on the outdoor unit
Multi-Zone (High Wall Unit)
H6
Low pressure switch protection
- Lack of refrigerant
- Stop valve unopened
- Damage of low pressure switch
Multi-Zone (High Wall Unit)
H7
Low pressure protection
- Lack of refrigerant
- Heat exchange viscera
Multi-Zone (High Wall Unit)
H8
Fault of four-way valve
- Damage of four-way valve
- Damage to coil of four-way valve
Multi-Zone (High Wall Unit)
H9
Inter-computer communication line connection fault
Multi-Zone (High Wall Unit)
J3
Communication error between the driver PCB and main PCB of the outdoor unit
- Damage of the driver PCB on the outdoor unit
- Damage of the main PCB on the outdoor unit
- Poor wiring
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
J7
Fault with the outdoor unit EEPROM
- Fault with the EE chip on the outdoor PCB
Multi-Zone (Cassette, Floor & Ceiling, Slim Duct)
L0
DC over volatge and under voltage failure
- Excessive input voltage
- Lower input voltage
Single Zone
L0
Overvoltage and undervoltage protection of indoor DC motor
- Excessive input voltage
- Lower input voltage
Multi-Zone (High Wall Unit)
L1
Compressor phase current over current protection
- Damage of compressor
- System viscera
Single Zone
L1
Overvoltage protection of compressor
- Damage of compressor
- System viscera
Multi-Zone (High Wall Unit)
L2
Compressor operation failure
- Damage of compressor
- System viscera
Multi-Zone (High Wall Unit)
L2
Compressor out-of-step failure
- Damage of compressor
- System viscera
Single Zone
L3
Compressor phase loss failure
- Damage of compressor
- Compressor power line not connected
Single Zone
L3
Phase-absence protection of compressor
- Damage of compressor
- Compressor power line not connected
Multi-Zone (High Wall Unit)
L4
IPM fault of compressor drive module
- Compressor drive module damage
Multi-Zone (High Wall Unit)
L4
Compressor driver module IPM failure
- Compressor drive module damage
Single Zone
L5
Compressor drive PFC hardware protection
- Damage of the PFC circuit components
- Reactor damage
Multi-Zone (High Wall Unit)
L5
PFC over-current hardware protection
- Damage of the PFC circuit components
- Reactor damage
Single Zone
L6
Compressor drive PFC software protection
- Excessive running current of the unit
- Voltage drops abruptly during operation
Multi-Zone (High Wall Unit)
L6
PFC over-current software protection
- Excessive running current of the unit
- Voltage drops abruptly during operation
Single Zone
L7
Current detection AD abnormal protection
- Sensor damage of compressor IPM module
Single Zone
L7
AD abnormal protection for compressor current detection
- Sensor damage of compressor IPM module
Multi-Zone (High Wall Unit)
L8
Compressor superpower protection
- Sampling resistance damage
- Excessive operating power of compressor
Multi-Zone (High Wall Unit)
L8
IPM temperature sensor fault
- Sampling resistance damage
- Excessive operating power of compressor
Single Zone
L9
IPM temperature sensor fault
- Compressor IPM module sensor damage
- Poor contact between compressor IPM module and radiator
Multi-Zone (High Wall Unit)
L9
IPM temperature sensor failure
- Compressor IPM module sensor damage
- Poor contact between compressor IPM module and radiator
Single Zone
LA
Compressor start-up failure
Single Zone
LC
PFC current detection AD abnormal protection
Single Zone
LD
DC fan current sense AD abnormal protection
Single Zone
Frequently Asked Questions
What is Voice Control/Hello Lisa?
"Hello Lisa" is a voice control feature that lets you turn on or control your AUX air conditioner by simply saying "Hello Lisa" followed by a command, like adjusting the temperature or mode. It works without needing a remote, app, or internet connection, making it super easy and convenient to use hands-free.
How do I connect the Wi-Fi function?
To connect your AUX mini-split to Wi-Fi, please check the Wi-Fi setup manual included with your indoor unit. To connect your AUX mini-split to Wi-Fi:
- Find the Wi-Fi setup manual with your indoor unit.
- Download the "AC Freedom" app on your phone (iOS/Android).
- Follow the app’s setup wizard to connect to a 2.4GHz Wi-Fi network.
How can I switch from
Celsius to Fahrenheit and back?
To switch the display temperature between Celsius and Fahrenheit on your AUX air conditioner, press and hold the "+" (plus) and "-" (minus) buttons on the remote control at the same time for 3 seconds. The display should toggle between Celsius (°C) and Fahrenheit (°F). Repeat the process to switch back.
What's "SOFT" mode?
The "SOFT" mode on your AUX air conditioner runs the unit at a lower fan speed to create a quiet, gentle airflow. This mode ensures comfortable cooling with minimal noise, making it ideal for relaxing or sleeping.
What's the "I-FEEL" feature?
The "I-FEEL" feature on your AUX air conditioner uses a temperature sensor in the remote control to monitor the temperature at your location in the room. It adjusts the air conditioner's cooling or heating to maintain your desired comfort level based on where you are, rather than the unit's location.
How does "Self-Cleaning" work?
The "Self-cleaning" feature on your AUX air conditioner cleans the indoor and outdoor unit’s coil in three steps:
- Freezing: The unit cools to freeze moisture on the coil.
- Melting: It heats up to melt the ice, washing away dirt.
- Drying: The fan runs to dry the coil completely.
The process takes about 30 minutes, leaving your AC clean and ready to use. Activate it using the "Self-Clean" button on your remote. Check your user manual for model-specific instructions.
How often should I clean my filter?
You should clean your AUX air conditioner's filter every 4 to 6 weeks to keep it running efficiently. If you use the AC heavily or live in a dusty area, clean it more often, like every 2 to 3 weeks
